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Allowance for Credit Losses - Age Analysis of Pas Due Loans Delinquencies - Deferment (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, modified in period, amount | $ 941,410 | $ 1,020,863 | $ 373,683
Financing receivable, modified in period, to total financing receivable, percentage | 100.00% | 100.00% | 100.00%
Private Education Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, modified in period, amount | $ 966,356 | $ 1,049,190 | $ 380,526
Loan Deferment |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, modified in period, amount | 24,946 | 28,327 | 6,843
Loan delinquent, current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, modified in period, amount | $ 766,273 | $ 837,473 | $ 334,967
Financing receivable, modified in period, to total financing receivable, percentage | 81.00% | 82.00% | 90.00%
Loan delinquent 30-59 days |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, modified in period, amount | $ 74,279 | $ 77,145 | $ 17,205
Financing receivable, modified in period, to total financing receivable, percentage | 8.00% | 8.00% | 4.00%
Loan delinquent 60-89 days |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, modified in period, amount | $ 43,208 | $ 44,846 | $ 7,689
Financing receivable, modified in period, to total financing receivable, percentage | 5.00% | 4.00% | 2.00%
Loan delinquent 90 days or greater past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing receivable, modified in period, amount | $ 57,650 | $ 61,399 | $ 13,822
Financing receivable, modified in period, to total financing receivable, percentage | 6.00% | 6.00% | 4.00%

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